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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/fs/ext2/super.c | |
3 | * | |
4 | * Copyright (C) 1992, 1993, 1994, 1995 | |
5 | * Remy Card (card@masi.ibp.fr) | |
6 | * Laboratoire MASI - Institut Blaise Pascal | |
7 | * Universite Pierre et Marie Curie (Paris VI) | |
8 | * | |
9 | * from | |
10 | * | |
11 | * linux/fs/minix/inode.c | |
12 | * | |
13 | * Copyright (C) 1991, 1992 Linus Torvalds | |
14 | * | |
15 | * Big-endian to little-endian byte-swapping/bitmaps by | |
16 | * David S. Miller (davem@caip.rutgers.edu), 1995 | |
17 | */ | |
18 | ||
1da177e4 LT |
19 | #include <linux/module.h> |
20 | #include <linux/string.h> | |
8fc2751b | 21 | #include <linux/fs.h> |
1da177e4 LT |
22 | #include <linux/slab.h> |
23 | #include <linux/init.h> | |
24 | #include <linux/blkdev.h> | |
25 | #include <linux/parser.h> | |
26 | #include <linux/random.h> | |
27 | #include <linux/buffer_head.h> | |
a5694255 | 28 | #include <linux/exportfs.h> |
1da177e4 | 29 | #include <linux/vfs.h> |
8fc2751b MB |
30 | #include <linux/seq_file.h> |
31 | #include <linux/mount.h> | |
d8ea6cf8 | 32 | #include <linux/log2.h> |
74abb989 | 33 | #include <linux/quotaops.h> |
1da177e4 LT |
34 | #include <asm/uaccess.h> |
35 | #include "ext2.h" | |
36 | #include "xattr.h" | |
37 | #include "acl.h" | |
6d79125b | 38 | #include "xip.h" |
1da177e4 LT |
39 | |
40 | static void ext2_sync_super(struct super_block *sb, | |
ee6921eb | 41 | struct ext2_super_block *es, int wait); |
1da177e4 | 42 | static int ext2_remount (struct super_block * sb, int * flags, char * data); |
726c3342 | 43 | static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf); |
40f31dd4 | 44 | static int ext2_sync_fs(struct super_block *sb, int wait); |
1da177e4 LT |
45 | |
46 | void ext2_error (struct super_block * sb, const char * function, | |
47 | const char * fmt, ...) | |
48 | { | |
49 | va_list args; | |
50 | struct ext2_sb_info *sbi = EXT2_SB(sb); | |
51 | struct ext2_super_block *es = sbi->s_es; | |
52 | ||
53 | if (!(sb->s_flags & MS_RDONLY)) { | |
c15271f4 | 54 | spin_lock(&sbi->s_lock); |
1da177e4 | 55 | sbi->s_mount_state |= EXT2_ERROR_FS; |
31f68e13 | 56 | es->s_state |= cpu_to_le16(EXT2_ERROR_FS); |
c15271f4 | 57 | spin_unlock(&sbi->s_lock); |
ee6921eb | 58 | ext2_sync_super(sb, es, 1); |
1da177e4 LT |
59 | } |
60 | ||
61 | va_start(args, fmt); | |
2314b07c | 62 | printk(KERN_CRIT "EXT2-fs (%s): error: %s: ", sb->s_id, function); |
1da177e4 LT |
63 | vprintk(fmt, args); |
64 | printk("\n"); | |
65 | va_end(args); | |
66 | ||
67 | if (test_opt(sb, ERRORS_PANIC)) | |
2314b07c | 68 | panic("EXT2-fs: panic from previous error\n"); |
1da177e4 | 69 | if (test_opt(sb, ERRORS_RO)) { |
2314b07c AF |
70 | ext2_msg(sb, KERN_CRIT, |
71 | "error: remounting filesystem read-only"); | |
1da177e4 LT |
72 | sb->s_flags |= MS_RDONLY; |
73 | } | |
74 | } | |
75 | ||
2314b07c AF |
76 | void ext2_msg(struct super_block *sb, const char *prefix, |
77 | const char *fmt, ...) | |
1da177e4 LT |
78 | { |
79 | va_list args; | |
80 | ||
81 | va_start(args, fmt); | |
2314b07c | 82 | printk("%sEXT2-fs (%s): ", prefix, sb->s_id); |
1da177e4 LT |
83 | vprintk(fmt, args); |
84 | printk("\n"); | |
85 | va_end(args); | |
86 | } | |
87 | ||
c15271f4 JB |
88 | /* |
89 | * This must be called with sbi->s_lock held. | |
90 | */ | |
1da177e4 LT |
91 | void ext2_update_dynamic_rev(struct super_block *sb) |
92 | { | |
93 | struct ext2_super_block *es = EXT2_SB(sb)->s_es; | |
94 | ||
95 | if (le32_to_cpu(es->s_rev_level) > EXT2_GOOD_OLD_REV) | |
96 | return; | |
97 | ||
2314b07c AF |
98 | ext2_msg(sb, KERN_WARNING, |
99 | "warning: updating to rev %d because of " | |
100 | "new feature flag, running e2fsck is recommended", | |
1da177e4 LT |
101 | EXT2_DYNAMIC_REV); |
102 | ||
103 | es->s_first_ino = cpu_to_le32(EXT2_GOOD_OLD_FIRST_INO); | |
104 | es->s_inode_size = cpu_to_le16(EXT2_GOOD_OLD_INODE_SIZE); | |
105 | es->s_rev_level = cpu_to_le32(EXT2_DYNAMIC_REV); | |
106 | /* leave es->s_feature_*compat flags alone */ | |
107 | /* es->s_uuid will be set by e2fsck if empty */ | |
108 | ||
109 | /* | |
110 | * The rest of the superblock fields should be zero, and if not it | |
111 | * means they are likely already in use, so leave them alone. We | |
112 | * can leave it up to e2fsck to clean up any inconsistencies there. | |
113 | */ | |
114 | } | |
115 | ||
116 | static void ext2_put_super (struct super_block * sb) | |
117 | { | |
118 | int db_count; | |
119 | int i; | |
120 | struct ext2_sb_info *sbi = EXT2_SB(sb); | |
121 | ||
e0ccfd95 CH |
122 | dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); |
123 | ||
8c85e125 CH |
124 | if (sb->s_dirt) |
125 | ext2_write_super(sb); | |
126 | ||
1da177e4 LT |
127 | ext2_xattr_put_super(sb); |
128 | if (!(sb->s_flags & MS_RDONLY)) { | |
129 | struct ext2_super_block *es = sbi->s_es; | |
130 | ||
c15271f4 | 131 | spin_lock(&sbi->s_lock); |
1da177e4 | 132 | es->s_state = cpu_to_le16(sbi->s_mount_state); |
c15271f4 | 133 | spin_unlock(&sbi->s_lock); |
ee6921eb | 134 | ext2_sync_super(sb, es, 1); |
1da177e4 LT |
135 | } |
136 | db_count = sbi->s_gdb_count; | |
137 | for (i = 0; i < db_count; i++) | |
138 | if (sbi->s_group_desc[i]) | |
139 | brelse (sbi->s_group_desc[i]); | |
140 | kfree(sbi->s_group_desc); | |
141 | kfree(sbi->s_debts); | |
142 | percpu_counter_destroy(&sbi->s_freeblocks_counter); | |
143 | percpu_counter_destroy(&sbi->s_freeinodes_counter); | |
144 | percpu_counter_destroy(&sbi->s_dirs_counter); | |
145 | brelse (sbi->s_sbh); | |
146 | sb->s_fs_info = NULL; | |
18a82eb9 | 147 | kfree(sbi->s_blockgroup_lock); |
1da177e4 | 148 | kfree(sbi); |
1da177e4 LT |
149 | } |
150 | ||
e18b890b | 151 | static struct kmem_cache * ext2_inode_cachep; |
1da177e4 LT |
152 | |
153 | static struct inode *ext2_alloc_inode(struct super_block *sb) | |
154 | { | |
155 | struct ext2_inode_info *ei; | |
e94b1766 | 156 | ei = (struct ext2_inode_info *)kmem_cache_alloc(ext2_inode_cachep, GFP_KERNEL); |
1da177e4 LT |
157 | if (!ei) |
158 | return NULL; | |
a686cd89 | 159 | ei->i_block_alloc_info = NULL; |
1da177e4 LT |
160 | ei->vfs_inode.i_version = 1; |
161 | return &ei->vfs_inode; | |
162 | } | |
163 | ||
fa0d7e3d | 164 | static void ext2_i_callback(struct rcu_head *head) |
1da177e4 | 165 | { |
fa0d7e3d NP |
166 | struct inode *inode = container_of(head, struct inode, i_rcu); |
167 | INIT_LIST_HEAD(&inode->i_dentry); | |
1da177e4 LT |
168 | kmem_cache_free(ext2_inode_cachep, EXT2_I(inode)); |
169 | } | |
170 | ||
fa0d7e3d NP |
171 | static void ext2_destroy_inode(struct inode *inode) |
172 | { | |
173 | call_rcu(&inode->i_rcu, ext2_i_callback); | |
174 | } | |
175 | ||
51cc5068 | 176 | static void init_once(void *foo) |
1da177e4 LT |
177 | { |
178 | struct ext2_inode_info *ei = (struct ext2_inode_info *) foo; | |
179 | ||
a35afb83 | 180 | rwlock_init(&ei->i_meta_lock); |
1da177e4 | 181 | #ifdef CONFIG_EXT2_FS_XATTR |
a35afb83 | 182 | init_rwsem(&ei->xattr_sem); |
1da177e4 | 183 | #endif |
a686cd89 | 184 | mutex_init(&ei->truncate_mutex); |
a35afb83 | 185 | inode_init_once(&ei->vfs_inode); |
1da177e4 | 186 | } |
20c2df83 | 187 | |
1da177e4 LT |
188 | static int init_inodecache(void) |
189 | { | |
190 | ext2_inode_cachep = kmem_cache_create("ext2_inode_cache", | |
191 | sizeof(struct ext2_inode_info), | |
fffb60f9 PJ |
192 | 0, (SLAB_RECLAIM_ACCOUNT| |
193 | SLAB_MEM_SPREAD), | |
20c2df83 | 194 | init_once); |
1da177e4 LT |
195 | if (ext2_inode_cachep == NULL) |
196 | return -ENOMEM; | |
197 | return 0; | |
198 | } | |
199 | ||
200 | static void destroy_inodecache(void) | |
201 | { | |
1a1d92c1 | 202 | kmem_cache_destroy(ext2_inode_cachep); |
1da177e4 LT |
203 | } |
204 | ||
8fc2751b MB |
205 | static int ext2_show_options(struct seq_file *seq, struct vfsmount *vfs) |
206 | { | |
93d44cb2 MS |
207 | struct super_block *sb = vfs->mnt_sb; |
208 | struct ext2_sb_info *sbi = EXT2_SB(sb); | |
209 | struct ext2_super_block *es = sbi->s_es; | |
210 | unsigned long def_mount_opts; | |
8fc2751b | 211 | |
c15271f4 | 212 | spin_lock(&sbi->s_lock); |
93d44cb2 MS |
213 | def_mount_opts = le32_to_cpu(es->s_default_mount_opts); |
214 | ||
215 | if (sbi->s_sb_block != 1) | |
216 | seq_printf(seq, ",sb=%lu", sbi->s_sb_block); | |
217 | if (test_opt(sb, MINIX_DF)) | |
218 | seq_puts(seq, ",minixdf"); | |
219 | if (test_opt(sb, GRPID)) | |
8fc2751b | 220 | seq_puts(seq, ",grpid"); |
93d44cb2 MS |
221 | if (!test_opt(sb, GRPID) && (def_mount_opts & EXT2_DEFM_BSDGROUPS)) |
222 | seq_puts(seq, ",nogrpid"); | |
223 | if (sbi->s_resuid != EXT2_DEF_RESUID || | |
224 | le16_to_cpu(es->s_def_resuid) != EXT2_DEF_RESUID) { | |
225 | seq_printf(seq, ",resuid=%u", sbi->s_resuid); | |
226 | } | |
227 | if (sbi->s_resgid != EXT2_DEF_RESGID || | |
228 | le16_to_cpu(es->s_def_resgid) != EXT2_DEF_RESGID) { | |
229 | seq_printf(seq, ",resgid=%u", sbi->s_resgid); | |
230 | } | |
14e11e10 | 231 | if (test_opt(sb, ERRORS_RO)) { |
93d44cb2 MS |
232 | int def_errors = le16_to_cpu(es->s_errors); |
233 | ||
234 | if (def_errors == EXT2_ERRORS_PANIC || | |
14e11e10 AK |
235 | def_errors == EXT2_ERRORS_CONTINUE) { |
236 | seq_puts(seq, ",errors=remount-ro"); | |
93d44cb2 MS |
237 | } |
238 | } | |
14e11e10 AK |
239 | if (test_opt(sb, ERRORS_CONT)) |
240 | seq_puts(seq, ",errors=continue"); | |
93d44cb2 MS |
241 | if (test_opt(sb, ERRORS_PANIC)) |
242 | seq_puts(seq, ",errors=panic"); | |
243 | if (test_opt(sb, NO_UID32)) | |
244 | seq_puts(seq, ",nouid32"); | |
245 | if (test_opt(sb, DEBUG)) | |
246 | seq_puts(seq, ",debug"); | |
247 | if (test_opt(sb, OLDALLOC)) | |
248 | seq_puts(seq, ",oldalloc"); | |
249 | ||
250 | #ifdef CONFIG_EXT2_FS_XATTR | |
251 | if (test_opt(sb, XATTR_USER)) | |
252 | seq_puts(seq, ",user_xattr"); | |
253 | if (!test_opt(sb, XATTR_USER) && | |
254 | (def_mount_opts & EXT2_DEFM_XATTR_USER)) { | |
255 | seq_puts(seq, ",nouser_xattr"); | |
256 | } | |
257 | #endif | |
258 | ||
259 | #ifdef CONFIG_EXT2_FS_POSIX_ACL | |
260 | if (test_opt(sb, POSIX_ACL)) | |
261 | seq_puts(seq, ",acl"); | |
262 | if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT2_DEFM_ACL)) | |
263 | seq_puts(seq, ",noacl"); | |
264 | #endif | |
265 | ||
266 | if (test_opt(sb, NOBH)) | |
267 | seq_puts(seq, ",nobh"); | |
8fc2751b MB |
268 | |
269 | #if defined(CONFIG_QUOTA) | |
270 | if (sbi->s_mount_opt & EXT2_MOUNT_USRQUOTA) | |
271 | seq_puts(seq, ",usrquota"); | |
272 | ||
273 | if (sbi->s_mount_opt & EXT2_MOUNT_GRPQUOTA) | |
274 | seq_puts(seq, ",grpquota"); | |
275 | #endif | |
276 | ||
83541796 CO |
277 | #if defined(CONFIG_EXT2_FS_XIP) |
278 | if (sbi->s_mount_opt & EXT2_MOUNT_XIP) | |
279 | seq_puts(seq, ",xip"); | |
280 | #endif | |
281 | ||
35c879dc MS |
282 | if (!test_opt(sb, RESERVATION)) |
283 | seq_puts(seq, ",noreservation"); | |
284 | ||
c15271f4 | 285 | spin_unlock(&sbi->s_lock); |
8fc2751b MB |
286 | return 0; |
287 | } | |
288 | ||
1da177e4 LT |
289 | #ifdef CONFIG_QUOTA |
290 | static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, size_t len, loff_t off); | |
291 | static ssize_t ext2_quota_write(struct super_block *sb, int type, const char *data, size_t len, loff_t off); | |
292 | #endif | |
293 | ||
ee9b6d61 | 294 | static const struct super_operations ext2_sops = { |
1da177e4 LT |
295 | .alloc_inode = ext2_alloc_inode, |
296 | .destroy_inode = ext2_destroy_inode, | |
1da177e4 | 297 | .write_inode = ext2_write_inode, |
72edc4d0 | 298 | .evict_inode = ext2_evict_inode, |
1da177e4 LT |
299 | .put_super = ext2_put_super, |
300 | .write_super = ext2_write_super, | |
40f31dd4 | 301 | .sync_fs = ext2_sync_fs, |
1da177e4 LT |
302 | .statfs = ext2_statfs, |
303 | .remount_fs = ext2_remount, | |
8fc2751b | 304 | .show_options = ext2_show_options, |
1da177e4 LT |
305 | #ifdef CONFIG_QUOTA |
306 | .quota_read = ext2_quota_read, | |
307 | .quota_write = ext2_quota_write, | |
308 | #endif | |
309 | }; | |
310 | ||
2e4c68e3 CH |
311 | static struct inode *ext2_nfs_get_inode(struct super_block *sb, |
312 | u64 ino, u32 generation) | |
ecaff756 | 313 | { |
ecaff756 | 314 | struct inode *inode; |
ecaff756 N |
315 | |
316 | if (ino < EXT2_FIRST_INO(sb) && ino != EXT2_ROOT_INO) | |
317 | return ERR_PTR(-ESTALE); | |
318 | if (ino > le32_to_cpu(EXT2_SB(sb)->s_es->s_inodes_count)) | |
319 | return ERR_PTR(-ESTALE); | |
320 | ||
321 | /* iget isn't really right if the inode is currently unallocated!! | |
322 | * ext2_read_inode currently does appropriate checks, but | |
323 | * it might be "neater" to call ext2_get_inode first and check | |
324 | * if the inode is valid..... | |
325 | */ | |
52fcf703 DH |
326 | inode = ext2_iget(sb, ino); |
327 | if (IS_ERR(inode)) | |
328 | return ERR_CAST(inode); | |
329 | if (generation && inode->i_generation != generation) { | |
ecaff756 N |
330 | /* we didn't find the right inode.. */ |
331 | iput(inode); | |
332 | return ERR_PTR(-ESTALE); | |
333 | } | |
2e4c68e3 CH |
334 | return inode; |
335 | } | |
336 | ||
337 | static struct dentry *ext2_fh_to_dentry(struct super_block *sb, struct fid *fid, | |
338 | int fh_len, int fh_type) | |
339 | { | |
340 | return generic_fh_to_dentry(sb, fid, fh_len, fh_type, | |
341 | ext2_nfs_get_inode); | |
342 | } | |
343 | ||
344 | static struct dentry *ext2_fh_to_parent(struct super_block *sb, struct fid *fid, | |
345 | int fh_len, int fh_type) | |
346 | { | |
347 | return generic_fh_to_parent(sb, fid, fh_len, fh_type, | |
348 | ext2_nfs_get_inode); | |
ecaff756 N |
349 | } |
350 | ||
1da177e4 LT |
351 | /* Yes, most of these are left as NULL!! |
352 | * A NULL value implies the default, which works with ext2-like file | |
353 | * systems, but can be improved upon. | |
354 | * Currently only get_parent is required. | |
355 | */ | |
39655164 | 356 | static const struct export_operations ext2_export_ops = { |
2e4c68e3 CH |
357 | .fh_to_dentry = ext2_fh_to_dentry, |
358 | .fh_to_parent = ext2_fh_to_parent, | |
1da177e4 LT |
359 | .get_parent = ext2_get_parent, |
360 | }; | |
361 | ||
362 | static unsigned long get_sb_block(void **data) | |
363 | { | |
364 | unsigned long sb_block; | |
365 | char *options = (char *) *data; | |
366 | ||
367 | if (!options || strncmp(options, "sb=", 3) != 0) | |
368 | return 1; /* Default location */ | |
369 | options += 3; | |
370 | sb_block = simple_strtoul(options, &options, 0); | |
371 | if (*options && *options != ',') { | |
372 | printk("EXT2-fs: Invalid sb specification: %s\n", | |
373 | (char *) *data); | |
374 | return 1; | |
375 | } | |
376 | if (*options == ',') | |
377 | options++; | |
378 | *data = (void *) options; | |
379 | return sb_block; | |
380 | } | |
381 | ||
382 | enum { | |
383 | Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, | |
8fc2751b | 384 | Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, |
2860b733 | 385 | Opt_err_ro, Opt_nouid32, Opt_nocheck, Opt_debug, |
8fc2751b MB |
386 | Opt_oldalloc, Opt_orlov, Opt_nobh, Opt_user_xattr, Opt_nouser_xattr, |
387 | Opt_acl, Opt_noacl, Opt_xip, Opt_ignore, Opt_err, Opt_quota, | |
a686cd89 | 388 | Opt_usrquota, Opt_grpquota, Opt_reservation, Opt_noreservation |
1da177e4 LT |
389 | }; |
390 | ||
a447c093 | 391 | static const match_table_t tokens = { |
1da177e4 LT |
392 | {Opt_bsd_df, "bsddf"}, |
393 | {Opt_minix_df, "minixdf"}, | |
394 | {Opt_grpid, "grpid"}, | |
395 | {Opt_grpid, "bsdgroups"}, | |
396 | {Opt_nogrpid, "nogrpid"}, | |
397 | {Opt_nogrpid, "sysvgroups"}, | |
398 | {Opt_resgid, "resgid=%u"}, | |
399 | {Opt_resuid, "resuid=%u"}, | |
400 | {Opt_sb, "sb=%u"}, | |
401 | {Opt_err_cont, "errors=continue"}, | |
402 | {Opt_err_panic, "errors=panic"}, | |
403 | {Opt_err_ro, "errors=remount-ro"}, | |
404 | {Opt_nouid32, "nouid32"}, | |
405 | {Opt_nocheck, "check=none"}, | |
406 | {Opt_nocheck, "nocheck"}, | |
1da177e4 LT |
407 | {Opt_debug, "debug"}, |
408 | {Opt_oldalloc, "oldalloc"}, | |
409 | {Opt_orlov, "orlov"}, | |
410 | {Opt_nobh, "nobh"}, | |
411 | {Opt_user_xattr, "user_xattr"}, | |
412 | {Opt_nouser_xattr, "nouser_xattr"}, | |
413 | {Opt_acl, "acl"}, | |
414 | {Opt_noacl, "noacl"}, | |
6d79125b | 415 | {Opt_xip, "xip"}, |
8fc2751b | 416 | {Opt_grpquota, "grpquota"}, |
1da177e4 | 417 | {Opt_ignore, "noquota"}, |
8fc2751b MB |
418 | {Opt_quota, "quota"}, |
419 | {Opt_usrquota, "usrquota"}, | |
a686cd89 MB |
420 | {Opt_reservation, "reservation"}, |
421 | {Opt_noreservation, "noreservation"}, | |
1da177e4 LT |
422 | {Opt_err, NULL} |
423 | }; | |
424 | ||
2314b07c | 425 | static int parse_options(char *options, struct super_block *sb) |
1da177e4 | 426 | { |
2314b07c AF |
427 | char *p; |
428 | struct ext2_sb_info *sbi = EXT2_SB(sb); | |
1da177e4 | 429 | substring_t args[MAX_OPT_ARGS]; |
1da177e4 LT |
430 | int option; |
431 | ||
432 | if (!options) | |
433 | return 1; | |
434 | ||
435 | while ((p = strsep (&options, ",")) != NULL) { | |
436 | int token; | |
437 | if (!*p) | |
438 | continue; | |
439 | ||
440 | token = match_token(p, tokens, args); | |
441 | switch (token) { | |
442 | case Opt_bsd_df: | |
443 | clear_opt (sbi->s_mount_opt, MINIX_DF); | |
444 | break; | |
445 | case Opt_minix_df: | |
446 | set_opt (sbi->s_mount_opt, MINIX_DF); | |
447 | break; | |
448 | case Opt_grpid: | |
449 | set_opt (sbi->s_mount_opt, GRPID); | |
450 | break; | |
451 | case Opt_nogrpid: | |
452 | clear_opt (sbi->s_mount_opt, GRPID); | |
453 | break; | |
454 | case Opt_resuid: | |
455 | if (match_int(&args[0], &option)) | |
456 | return 0; | |
457 | sbi->s_resuid = option; | |
458 | break; | |
459 | case Opt_resgid: | |
460 | if (match_int(&args[0], &option)) | |
461 | return 0; | |
462 | sbi->s_resgid = option; | |
463 | break; | |
464 | case Opt_sb: | |
465 | /* handled by get_sb_block() instead of here */ | |
466 | /* *sb_block = match_int(&args[0]); */ | |
467 | break; | |
468 | case Opt_err_panic: | |
5a2b4062 VA |
469 | clear_opt (sbi->s_mount_opt, ERRORS_CONT); |
470 | clear_opt (sbi->s_mount_opt, ERRORS_RO); | |
471 | set_opt (sbi->s_mount_opt, ERRORS_PANIC); | |
1da177e4 LT |
472 | break; |
473 | case Opt_err_ro: | |
5a2b4062 VA |
474 | clear_opt (sbi->s_mount_opt, ERRORS_CONT); |
475 | clear_opt (sbi->s_mount_opt, ERRORS_PANIC); | |
476 | set_opt (sbi->s_mount_opt, ERRORS_RO); | |
1da177e4 LT |
477 | break; |
478 | case Opt_err_cont: | |
5a2b4062 VA |
479 | clear_opt (sbi->s_mount_opt, ERRORS_RO); |
480 | clear_opt (sbi->s_mount_opt, ERRORS_PANIC); | |
481 | set_opt (sbi->s_mount_opt, ERRORS_CONT); | |
1da177e4 LT |
482 | break; |
483 | case Opt_nouid32: | |
484 | set_opt (sbi->s_mount_opt, NO_UID32); | |
485 | break; | |
1da177e4 LT |
486 | case Opt_nocheck: |
487 | clear_opt (sbi->s_mount_opt, CHECK); | |
488 | break; | |
489 | case Opt_debug: | |
490 | set_opt (sbi->s_mount_opt, DEBUG); | |
491 | break; | |
492 | case Opt_oldalloc: | |
493 | set_opt (sbi->s_mount_opt, OLDALLOC); | |
494 | break; | |
495 | case Opt_orlov: | |
496 | clear_opt (sbi->s_mount_opt, OLDALLOC); | |
497 | break; | |
498 | case Opt_nobh: | |
499 | set_opt (sbi->s_mount_opt, NOBH); | |
500 | break; | |
501 | #ifdef CONFIG_EXT2_FS_XATTR | |
502 | case Opt_user_xattr: | |
503 | set_opt (sbi->s_mount_opt, XATTR_USER); | |
504 | break; | |
505 | case Opt_nouser_xattr: | |
506 | clear_opt (sbi->s_mount_opt, XATTR_USER); | |
507 | break; | |
508 | #else | |
509 | case Opt_user_xattr: | |
510 | case Opt_nouser_xattr: | |
2314b07c AF |
511 | ext2_msg(sb, KERN_INFO, "(no)user_xattr options" |
512 | "not supported"); | |
1da177e4 LT |
513 | break; |
514 | #endif | |
515 | #ifdef CONFIG_EXT2_FS_POSIX_ACL | |
516 | case Opt_acl: | |
517 | set_opt(sbi->s_mount_opt, POSIX_ACL); | |
518 | break; | |
519 | case Opt_noacl: | |
520 | clear_opt(sbi->s_mount_opt, POSIX_ACL); | |
521 | break; | |
522 | #else | |
523 | case Opt_acl: | |
524 | case Opt_noacl: | |
2314b07c AF |
525 | ext2_msg(sb, KERN_INFO, |
526 | "(no)acl options not supported"); | |
1da177e4 LT |
527 | break; |
528 | #endif | |
6d79125b CO |
529 | case Opt_xip: |
530 | #ifdef CONFIG_EXT2_FS_XIP | |
531 | set_opt (sbi->s_mount_opt, XIP); | |
532 | #else | |
2314b07c | 533 | ext2_msg(sb, KERN_INFO, "xip option not supported"); |
6d79125b CO |
534 | #endif |
535 | break; | |
8fc2751b MB |
536 | |
537 | #if defined(CONFIG_QUOTA) | |
538 | case Opt_quota: | |
539 | case Opt_usrquota: | |
540 | set_opt(sbi->s_mount_opt, USRQUOTA); | |
541 | break; | |
542 | ||
543 | case Opt_grpquota: | |
544 | set_opt(sbi->s_mount_opt, GRPQUOTA); | |
545 | break; | |
546 | #else | |
547 | case Opt_quota: | |
548 | case Opt_usrquota: | |
549 | case Opt_grpquota: | |
2314b07c AF |
550 | ext2_msg(sb, KERN_INFO, |
551 | "quota operations not supported"); | |
8fc2751b MB |
552 | break; |
553 | #endif | |
554 | ||
a686cd89 MB |
555 | case Opt_reservation: |
556 | set_opt(sbi->s_mount_opt, RESERVATION); | |
2314b07c | 557 | ext2_msg(sb, KERN_INFO, "reservations ON"); |
a686cd89 MB |
558 | break; |
559 | case Opt_noreservation: | |
560 | clear_opt(sbi->s_mount_opt, RESERVATION); | |
2314b07c | 561 | ext2_msg(sb, KERN_INFO, "reservations OFF"); |
a686cd89 | 562 | break; |
1da177e4 LT |
563 | case Opt_ignore: |
564 | break; | |
565 | default: | |
566 | return 0; | |
567 | } | |
568 | } | |
1da177e4 LT |
569 | return 1; |
570 | } | |
571 | ||
572 | static int ext2_setup_super (struct super_block * sb, | |
573 | struct ext2_super_block * es, | |
574 | int read_only) | |
575 | { | |
576 | int res = 0; | |
577 | struct ext2_sb_info *sbi = EXT2_SB(sb); | |
578 | ||
579 | if (le32_to_cpu(es->s_rev_level) > EXT2_MAX_SUPP_REV) { | |
2314b07c AF |
580 | ext2_msg(sb, KERN_ERR, |
581 | "error: revision level too high, " | |
582 | "forcing read-only mode"); | |
1da177e4 LT |
583 | res = MS_RDONLY; |
584 | } | |
585 | if (read_only) | |
586 | return res; | |
587 | if (!(sbi->s_mount_state & EXT2_VALID_FS)) | |
2314b07c AF |
588 | ext2_msg(sb, KERN_WARNING, |
589 | "warning: mounting unchecked fs, " | |
590 | "running e2fsck is recommended"); | |
1da177e4 | 591 | else if ((sbi->s_mount_state & EXT2_ERROR_FS)) |
2314b07c AF |
592 | ext2_msg(sb, KERN_WARNING, |
593 | "warning: mounting fs with errors, " | |
594 | "running e2fsck is recommended"); | |
1da177e4 LT |
595 | else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 && |
596 | le16_to_cpu(es->s_mnt_count) >= | |
597 | (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) | |
2314b07c AF |
598 | ext2_msg(sb, KERN_WARNING, |
599 | "warning: maximal mount count reached, " | |
600 | "running e2fsck is recommended"); | |
1da177e4 | 601 | else if (le32_to_cpu(es->s_checkinterval) && |
2314b07c AF |
602 | (le32_to_cpu(es->s_lastcheck) + |
603 | le32_to_cpu(es->s_checkinterval) <= get_seconds())) | |
604 | ext2_msg(sb, KERN_WARNING, | |
605 | "warning: checktime reached, " | |
606 | "running e2fsck is recommended"); | |
1da177e4 LT |
607 | if (!le16_to_cpu(es->s_max_mnt_count)) |
608 | es->s_max_mnt_count = cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT); | |
fba4d399 | 609 | le16_add_cpu(&es->s_mnt_count, 1); |
1da177e4 | 610 | if (test_opt (sb, DEBUG)) |
2314b07c AF |
611 | ext2_msg(sb, KERN_INFO, "%s, %s, bs=%lu, fs=%lu, gc=%lu, " |
612 | "bpg=%lu, ipg=%lu, mo=%04lx]", | |
1da177e4 LT |
613 | EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize, |
614 | sbi->s_frag_size, | |
615 | sbi->s_groups_count, | |
616 | EXT2_BLOCKS_PER_GROUP(sb), | |
617 | EXT2_INODES_PER_GROUP(sb), | |
618 | sbi->s_mount_opt); | |
1da177e4 LT |
619 | return res; |
620 | } | |
621 | ||
197cd65a | 622 | static int ext2_check_descriptors(struct super_block *sb) |
1da177e4 LT |
623 | { |
624 | int i; | |
1da177e4 | 625 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
1da177e4 LT |
626 | |
627 | ext2_debug ("Checking group descriptors"); | |
628 | ||
197cd65a AM |
629 | for (i = 0; i < sbi->s_groups_count; i++) { |
630 | struct ext2_group_desc *gdp = ext2_get_group_desc(sb, i, NULL); | |
24097d12 AM |
631 | ext2_fsblk_t first_block = ext2_group_first_block_no(sb, i); |
632 | ext2_fsblk_t last_block; | |
197cd65a | 633 | |
41f04d85 ES |
634 | if (i == sbi->s_groups_count - 1) |
635 | last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1; | |
636 | else | |
637 | last_block = first_block + | |
638 | (EXT2_BLOCKS_PER_GROUP(sb) - 1); | |
639 | ||
41f04d85 ES |
640 | if (le32_to_cpu(gdp->bg_block_bitmap) < first_block || |
641 | le32_to_cpu(gdp->bg_block_bitmap) > last_block) | |
1da177e4 LT |
642 | { |
643 | ext2_error (sb, "ext2_check_descriptors", | |
644 | "Block bitmap for group %d" | |
645 | " not in group (block %lu)!", | |
646 | i, (unsigned long) le32_to_cpu(gdp->bg_block_bitmap)); | |
647 | return 0; | |
648 | } | |
41f04d85 ES |
649 | if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block || |
650 | le32_to_cpu(gdp->bg_inode_bitmap) > last_block) | |
1da177e4 LT |
651 | { |
652 | ext2_error (sb, "ext2_check_descriptors", | |
653 | "Inode bitmap for group %d" | |
654 | " not in group (block %lu)!", | |
655 | i, (unsigned long) le32_to_cpu(gdp->bg_inode_bitmap)); | |
656 | return 0; | |
657 | } | |
41f04d85 | 658 | if (le32_to_cpu(gdp->bg_inode_table) < first_block || |
780dcdb2 | 659 | le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 > |
41f04d85 | 660 | last_block) |
1da177e4 LT |
661 | { |
662 | ext2_error (sb, "ext2_check_descriptors", | |
663 | "Inode table for group %d" | |
664 | " not in group (block %lu)!", | |
665 | i, (unsigned long) le32_to_cpu(gdp->bg_inode_table)); | |
666 | return 0; | |
667 | } | |
1da177e4 LT |
668 | } |
669 | return 1; | |
670 | } | |
671 | ||
1da177e4 LT |
672 | /* |
673 | * Maximal file size. There is a direct, and {,double-,triple-}indirect | |
674 | * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks. | |
675 | * We need to be 1 filesystem block less than the 2^32 sector limit. | |
676 | */ | |
677 | static loff_t ext2_max_size(int bits) | |
678 | { | |
679 | loff_t res = EXT2_NDIR_BLOCKS; | |
902be4c5 AK |
680 | int meta_blocks; |
681 | loff_t upper_limit; | |
682 | ||
683 | /* This is calculated to be the largest file size for a | |
684 | * dense, file such that the total number of | |
1da177e4 | 685 | * sectors in the file, including data and all indirect blocks, |
902be4c5 AK |
686 | * does not exceed 2^32 -1 |
687 | * __u32 i_blocks representing the total number of | |
688 | * 512 bytes blocks of the file | |
689 | */ | |
690 | upper_limit = (1LL << 32) - 1; | |
691 | ||
692 | /* total blocks in file system block size */ | |
693 | upper_limit >>= (bits - 9); | |
694 | ||
695 | ||
696 | /* indirect blocks */ | |
697 | meta_blocks = 1; | |
698 | /* double indirect blocks */ | |
699 | meta_blocks += 1 + (1LL << (bits-2)); | |
700 | /* tripple indirect blocks */ | |
701 | meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2))); | |
702 | ||
703 | upper_limit -= meta_blocks; | |
704 | upper_limit <<= bits; | |
1da177e4 LT |
705 | |
706 | res += 1LL << (bits-2); | |
707 | res += 1LL << (2*(bits-2)); | |
708 | res += 1LL << (3*(bits-2)); | |
709 | res <<= bits; | |
710 | if (res > upper_limit) | |
711 | res = upper_limit; | |
902be4c5 AK |
712 | |
713 | if (res > MAX_LFS_FILESIZE) | |
714 | res = MAX_LFS_FILESIZE; | |
715 | ||
1da177e4 LT |
716 | return res; |
717 | } | |
718 | ||
719 | static unsigned long descriptor_loc(struct super_block *sb, | |
720 | unsigned long logic_sb_block, | |
721 | int nr) | |
722 | { | |
723 | struct ext2_sb_info *sbi = EXT2_SB(sb); | |
24097d12 | 724 | unsigned long bg, first_meta_bg; |
1da177e4 LT |
725 | int has_super = 0; |
726 | ||
1da177e4 LT |
727 | first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); |
728 | ||
729 | if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_META_BG) || | |
730 | nr < first_meta_bg) | |
731 | return (logic_sb_block + nr + 1); | |
732 | bg = sbi->s_desc_per_block * nr; | |
733 | if (ext2_bg_has_super(sb, bg)) | |
734 | has_super = 1; | |
24097d12 AM |
735 | |
736 | return ext2_group_first_block_no(sb, bg) + has_super; | |
1da177e4 LT |
737 | } |
738 | ||
739 | static int ext2_fill_super(struct super_block *sb, void *data, int silent) | |
740 | { | |
741 | struct buffer_head * bh; | |
742 | struct ext2_sb_info * sbi; | |
743 | struct ext2_super_block * es; | |
744 | struct inode *root; | |
745 | unsigned long block; | |
746 | unsigned long sb_block = get_sb_block(&data); | |
747 | unsigned long logic_sb_block; | |
748 | unsigned long offset = 0; | |
749 | unsigned long def_mount_opts; | |
52fcf703 | 750 | long ret = -EINVAL; |
1da177e4 LT |
751 | int blocksize = BLOCK_SIZE; |
752 | int db_count; | |
753 | int i, j; | |
754 | __le32 features; | |
833f4077 | 755 | int err; |
1da177e4 | 756 | |
db719222 | 757 | err = -ENOMEM; |
f8314dc6 | 758 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); |
1da177e4 | 759 | if (!sbi) |
db719222 | 760 | goto failed_unlock; |
18a82eb9 PE |
761 | |
762 | sbi->s_blockgroup_lock = | |
763 | kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL); | |
764 | if (!sbi->s_blockgroup_lock) { | |
765 | kfree(sbi); | |
db719222 | 766 | goto failed_unlock; |
18a82eb9 | 767 | } |
1da177e4 | 768 | sb->s_fs_info = sbi; |
93d44cb2 | 769 | sbi->s_sb_block = sb_block; |
1da177e4 | 770 | |
c15271f4 JB |
771 | spin_lock_init(&sbi->s_lock); |
772 | ||
1da177e4 LT |
773 | /* |
774 | * See what the current blocksize for the device is, and | |
775 | * use that as the blocksize. Otherwise (or if the blocksize | |
776 | * is smaller than the default) use the default. | |
777 | * This is important for devices that have a hardware | |
778 | * sectorsize that is larger than the default. | |
779 | */ | |
780 | blocksize = sb_min_blocksize(sb, BLOCK_SIZE); | |
781 | if (!blocksize) { | |
2314b07c | 782 | ext2_msg(sb, KERN_ERR, "error: unable to set blocksize"); |
1da177e4 LT |
783 | goto failed_sbi; |
784 | } | |
785 | ||
786 | /* | |
787 | * If the superblock doesn't start on a hardware sector boundary, | |
788 | * calculate the offset. | |
789 | */ | |
790 | if (blocksize != BLOCK_SIZE) { | |
791 | logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; | |
792 | offset = (sb_block*BLOCK_SIZE) % blocksize; | |
793 | } else { | |
794 | logic_sb_block = sb_block; | |
795 | } | |
796 | ||
797 | if (!(bh = sb_bread(sb, logic_sb_block))) { | |
2314b07c | 798 | ext2_msg(sb, KERN_ERR, "error: unable to read superblock"); |
1da177e4 LT |
799 | goto failed_sbi; |
800 | } | |
801 | /* | |
802 | * Note: s_es must be initialized as soon as possible because | |
803 | * some ext2 macro-instructions depend on its value | |
804 | */ | |
805 | es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); | |
806 | sbi->s_es = es; | |
807 | sb->s_magic = le16_to_cpu(es->s_magic); | |
808 | ||
809 | if (sb->s_magic != EXT2_SUPER_MAGIC) | |
810 | goto cantfind_ext2; | |
811 | ||
812 | /* Set defaults before we parse the mount options */ | |
813 | def_mount_opts = le32_to_cpu(es->s_default_mount_opts); | |
814 | if (def_mount_opts & EXT2_DEFM_DEBUG) | |
815 | set_opt(sbi->s_mount_opt, DEBUG); | |
816 | if (def_mount_opts & EXT2_DEFM_BSDGROUPS) | |
817 | set_opt(sbi->s_mount_opt, GRPID); | |
818 | if (def_mount_opts & EXT2_DEFM_UID16) | |
819 | set_opt(sbi->s_mount_opt, NO_UID32); | |
2e7842b8 | 820 | #ifdef CONFIG_EXT2_FS_XATTR |
1da177e4 LT |
821 | if (def_mount_opts & EXT2_DEFM_XATTR_USER) |
822 | set_opt(sbi->s_mount_opt, XATTR_USER); | |
2e7842b8 HD |
823 | #endif |
824 | #ifdef CONFIG_EXT2_FS_POSIX_ACL | |
1da177e4 LT |
825 | if (def_mount_opts & EXT2_DEFM_ACL) |
826 | set_opt(sbi->s_mount_opt, POSIX_ACL); | |
2e7842b8 | 827 | #endif |
1da177e4 LT |
828 | |
829 | if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC) | |
830 | set_opt(sbi->s_mount_opt, ERRORS_PANIC); | |
14e11e10 | 831 | else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_CONTINUE) |
5a2b4062 | 832 | set_opt(sbi->s_mount_opt, ERRORS_CONT); |
14e11e10 AK |
833 | else |
834 | set_opt(sbi->s_mount_opt, ERRORS_RO); | |
1da177e4 LT |
835 | |
836 | sbi->s_resuid = le16_to_cpu(es->s_def_resuid); | |
837 | sbi->s_resgid = le16_to_cpu(es->s_def_resgid); | |
838 | ||
a686cd89 MB |
839 | set_opt(sbi->s_mount_opt, RESERVATION); |
840 | ||
2314b07c | 841 | if (!parse_options((char *) data, sb)) |
1da177e4 LT |
842 | goto failed_mount; |
843 | ||
844 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | | |
845 | ((EXT2_SB(sb)->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? | |
846 | MS_POSIXACL : 0); | |
847 | ||
6d79125b CO |
848 | ext2_xip_verify_sb(sb); /* see if bdev supports xip, unset |
849 | EXT2_MOUNT_XIP if not */ | |
850 | ||
1da177e4 LT |
851 | if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV && |
852 | (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) || | |
853 | EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) || | |
854 | EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U))) | |
2314b07c AF |
855 | ext2_msg(sb, KERN_WARNING, |
856 | "warning: feature flags set on rev 0 fs, " | |
857 | "running e2fsck is recommended"); | |
1da177e4 LT |
858 | /* |
859 | * Check feature flags regardless of the revision level, since we | |
860 | * previously didn't change the revision level when setting the flags, | |
861 | * so there is a chance incompat flags are set on a rev 0 filesystem. | |
862 | */ | |
863 | features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP); | |
864 | if (features) { | |
2314b07c AF |
865 | ext2_msg(sb, KERN_ERR, "error: couldn't mount because of " |
866 | "unsupported optional features (%x)", | |
867 | le32_to_cpu(features)); | |
1da177e4 LT |
868 | goto failed_mount; |
869 | } | |
870 | if (!(sb->s_flags & MS_RDONLY) && | |
871 | (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){ | |
2314b07c AF |
872 | ext2_msg(sb, KERN_ERR, "error: couldn't mount RDWR because of " |
873 | "unsupported optional features (%x)", | |
874 | le32_to_cpu(features)); | |
1da177e4 LT |
875 | goto failed_mount; |
876 | } | |
877 | ||
878 | blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size); | |
879 | ||
a8e3eff4 | 880 | if (ext2_use_xip(sb) && blocksize != PAGE_SIZE) { |
6d79125b | 881 | if (!silent) |
2314b07c AF |
882 | ext2_msg(sb, KERN_ERR, |
883 | "error: unsupported blocksize for xip"); | |
6d79125b CO |
884 | goto failed_mount; |
885 | } | |
886 | ||
1da177e4 LT |
887 | /* If the blocksize doesn't match, re-read the thing.. */ |
888 | if (sb->s_blocksize != blocksize) { | |
889 | brelse(bh); | |
890 | ||
891 | if (!sb_set_blocksize(sb, blocksize)) { | |
2314b07c | 892 | ext2_msg(sb, KERN_ERR, "error: blocksize is too small"); |
1da177e4 LT |
893 | goto failed_sbi; |
894 | } | |
895 | ||
896 | logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; | |
897 | offset = (sb_block*BLOCK_SIZE) % blocksize; | |
898 | bh = sb_bread(sb, logic_sb_block); | |
899 | if(!bh) { | |
2314b07c AF |
900 | ext2_msg(sb, KERN_ERR, "error: couldn't read" |
901 | "superblock on 2nd try"); | |
1da177e4 LT |
902 | goto failed_sbi; |
903 | } | |
904 | es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); | |
905 | sbi->s_es = es; | |
906 | if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) { | |
2314b07c | 907 | ext2_msg(sb, KERN_ERR, "error: magic mismatch"); |
1da177e4 LT |
908 | goto failed_mount; |
909 | } | |
910 | } | |
911 | ||
912 | sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits); | |
913 | ||
914 | if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) { | |
915 | sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE; | |
916 | sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO; | |
917 | } else { | |
918 | sbi->s_inode_size = le16_to_cpu(es->s_inode_size); | |
919 | sbi->s_first_ino = le32_to_cpu(es->s_first_ino); | |
920 | if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) || | |
d8ea6cf8 | 921 | !is_power_of_2(sbi->s_inode_size) || |
1da177e4 | 922 | (sbi->s_inode_size > blocksize)) { |
2314b07c AF |
923 | ext2_msg(sb, KERN_ERR, |
924 | "error: unsupported inode size: %d", | |
1da177e4 LT |
925 | sbi->s_inode_size); |
926 | goto failed_mount; | |
927 | } | |
928 | } | |
929 | ||
930 | sbi->s_frag_size = EXT2_MIN_FRAG_SIZE << | |
931 | le32_to_cpu(es->s_log_frag_size); | |
932 | if (sbi->s_frag_size == 0) | |
933 | goto cantfind_ext2; | |
934 | sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size; | |
935 | ||
936 | sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); | |
937 | sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group); | |
938 | sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); | |
939 | ||
940 | if (EXT2_INODE_SIZE(sb) == 0) | |
941 | goto cantfind_ext2; | |
942 | sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb); | |
607eb266 | 943 | if (sbi->s_inodes_per_block == 0 || sbi->s_inodes_per_group == 0) |
1da177e4 LT |
944 | goto cantfind_ext2; |
945 | sbi->s_itb_per_group = sbi->s_inodes_per_group / | |
946 | sbi->s_inodes_per_block; | |
947 | sbi->s_desc_per_block = sb->s_blocksize / | |
948 | sizeof (struct ext2_group_desc); | |
949 | sbi->s_sbh = bh; | |
950 | sbi->s_mount_state = le16_to_cpu(es->s_state); | |
951 | sbi->s_addr_per_block_bits = | |
f0d1b0b3 | 952 | ilog2 (EXT2_ADDR_PER_BLOCK(sb)); |
1da177e4 | 953 | sbi->s_desc_per_block_bits = |
f0d1b0b3 | 954 | ilog2 (EXT2_DESC_PER_BLOCK(sb)); |
1da177e4 LT |
955 | |
956 | if (sb->s_magic != EXT2_SUPER_MAGIC) | |
957 | goto cantfind_ext2; | |
958 | ||
959 | if (sb->s_blocksize != bh->b_size) { | |
960 | if (!silent) | |
2314b07c | 961 | ext2_msg(sb, KERN_ERR, "error: unsupported blocksize"); |
1da177e4 LT |
962 | goto failed_mount; |
963 | } | |
964 | ||
965 | if (sb->s_blocksize != sbi->s_frag_size) { | |
2314b07c AF |
966 | ext2_msg(sb, KERN_ERR, |
967 | "error: fragsize %lu != blocksize %lu" | |
968 | "(not supported yet)", | |
1da177e4 LT |
969 | sbi->s_frag_size, sb->s_blocksize); |
970 | goto failed_mount; | |
971 | } | |
972 | ||
973 | if (sbi->s_blocks_per_group > sb->s_blocksize * 8) { | |
2314b07c AF |
974 | ext2_msg(sb, KERN_ERR, |
975 | "error: #blocks per group too big: %lu", | |
1da177e4 LT |
976 | sbi->s_blocks_per_group); |
977 | goto failed_mount; | |
978 | } | |
979 | if (sbi->s_frags_per_group > sb->s_blocksize * 8) { | |
2314b07c AF |
980 | ext2_msg(sb, KERN_ERR, |
981 | "error: #fragments per group too big: %lu", | |
1da177e4 LT |
982 | sbi->s_frags_per_group); |
983 | goto failed_mount; | |
984 | } | |
985 | if (sbi->s_inodes_per_group > sb->s_blocksize * 8) { | |
2314b07c AF |
986 | ext2_msg(sb, KERN_ERR, |
987 | "error: #inodes per group too big: %lu", | |
1da177e4 LT |
988 | sbi->s_inodes_per_group); |
989 | goto failed_mount; | |
990 | } | |
991 | ||
992 | if (EXT2_BLOCKS_PER_GROUP(sb) == 0) | |
993 | goto cantfind_ext2; | |
41f04d85 ES |
994 | sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) - |
995 | le32_to_cpu(es->s_first_data_block) - 1) | |
996 | / EXT2_BLOCKS_PER_GROUP(sb)) + 1; | |
1da177e4 LT |
997 | db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) / |
998 | EXT2_DESC_PER_BLOCK(sb); | |
999 | sbi->s_group_desc = kmalloc (db_count * sizeof (struct buffer_head *), GFP_KERNEL); | |
1000 | if (sbi->s_group_desc == NULL) { | |
2314b07c | 1001 | ext2_msg(sb, KERN_ERR, "error: not enough memory"); |
1da177e4 LT |
1002 | goto failed_mount; |
1003 | } | |
18a82eb9 | 1004 | bgl_lock_init(sbi->s_blockgroup_lock); |
dd00cc48 | 1005 | sbi->s_debts = kcalloc(sbi->s_groups_count, sizeof(*sbi->s_debts), GFP_KERNEL); |
1da177e4 | 1006 | if (!sbi->s_debts) { |
2314b07c | 1007 | ext2_msg(sb, KERN_ERR, "error: not enough memory"); |
1da177e4 LT |
1008 | goto failed_mount_group_desc; |
1009 | } | |
1da177e4 LT |
1010 | for (i = 0; i < db_count; i++) { |
1011 | block = descriptor_loc(sb, logic_sb_block, i); | |
1012 | sbi->s_group_desc[i] = sb_bread(sb, block); | |
1013 | if (!sbi->s_group_desc[i]) { | |
1014 | for (j = 0; j < i; j++) | |
1015 | brelse (sbi->s_group_desc[j]); | |
2314b07c AF |
1016 | ext2_msg(sb, KERN_ERR, |
1017 | "error: unable to read group descriptors"); | |
1da177e4 LT |
1018 | goto failed_mount_group_desc; |
1019 | } | |
1020 | } | |
1021 | if (!ext2_check_descriptors (sb)) { | |
2314b07c | 1022 | ext2_msg(sb, KERN_ERR, "group descriptors corrupted"); |
1da177e4 LT |
1023 | goto failed_mount2; |
1024 | } | |
1025 | sbi->s_gdb_count = db_count; | |
1026 | get_random_bytes(&sbi->s_next_generation, sizeof(u32)); | |
1027 | spin_lock_init(&sbi->s_next_gen_lock); | |
0216bfcf | 1028 | |
a686cd89 MB |
1029 | /* per fileystem reservation list head & lock */ |
1030 | spin_lock_init(&sbi->s_rsv_window_lock); | |
1031 | sbi->s_rsv_window_root = RB_ROOT; | |
1032 | /* | |
1033 | * Add a single, static dummy reservation to the start of the | |
1034 | * reservation window list --- it gives us a placeholder for | |
1035 | * append-at-start-of-list which makes the allocation logic | |
1036 | * _much_ simpler. | |
1037 | */ | |
1038 | sbi->s_rsv_window_head.rsv_start = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; | |
1039 | sbi->s_rsv_window_head.rsv_end = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; | |
1040 | sbi->s_rsv_window_head.rsv_alloc_hit = 0; | |
1041 | sbi->s_rsv_window_head.rsv_goal_size = 0; | |
1042 | ext2_rsv_window_add(sb, &sbi->s_rsv_window_head); | |
1043 | ||
833f4077 | 1044 | err = percpu_counter_init(&sbi->s_freeblocks_counter, |
0216bfcf | 1045 | ext2_count_free_blocks(sb)); |
833f4077 PZ |
1046 | if (!err) { |
1047 | err = percpu_counter_init(&sbi->s_freeinodes_counter, | |
0216bfcf | 1048 | ext2_count_free_inodes(sb)); |
833f4077 PZ |
1049 | } |
1050 | if (!err) { | |
1051 | err = percpu_counter_init(&sbi->s_dirs_counter, | |
0216bfcf | 1052 | ext2_count_dirs(sb)); |
833f4077 PZ |
1053 | } |
1054 | if (err) { | |
2314b07c | 1055 | ext2_msg(sb, KERN_ERR, "error: insufficient memory"); |
833f4077 PZ |
1056 | goto failed_mount3; |
1057 | } | |
1da177e4 LT |
1058 | /* |
1059 | * set up enough so that it can read an inode | |
1060 | */ | |
1061 | sb->s_op = &ext2_sops; | |
1062 | sb->s_export_op = &ext2_export_ops; | |
1063 | sb->s_xattr = ext2_xattr_handlers; | |
123e9caf CH |
1064 | |
1065 | #ifdef CONFIG_QUOTA | |
1066 | sb->dq_op = &dquot_operations; | |
287a8095 | 1067 | sb->s_qcop = &dquot_quotactl_ops; |
123e9caf CH |
1068 | #endif |
1069 | ||
52fcf703 DH |
1070 | root = ext2_iget(sb, EXT2_ROOT_INO); |
1071 | if (IS_ERR(root)) { | |
1072 | ret = PTR_ERR(root); | |
0216bfcf | 1073 | goto failed_mount3; |
1da177e4 LT |
1074 | } |
1075 | if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { | |
52fcf703 | 1076 | iput(root); |
2314b07c | 1077 | ext2_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck"); |
0216bfcf | 1078 | goto failed_mount3; |
1da177e4 | 1079 | } |
52fcf703 DH |
1080 | |
1081 | sb->s_root = d_alloc_root(root); | |
1082 | if (!sb->s_root) { | |
1083 | iput(root); | |
2314b07c | 1084 | ext2_msg(sb, KERN_ERR, "error: get root inode failed"); |
52fcf703 DH |
1085 | ret = -ENOMEM; |
1086 | goto failed_mount3; | |
1087 | } | |
1da177e4 | 1088 | if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) |
2314b07c AF |
1089 | ext2_msg(sb, KERN_WARNING, |
1090 | "warning: mounting ext3 filesystem as ext2"); | |
4c96a68b JB |
1091 | if (ext2_setup_super (sb, es, sb->s_flags & MS_RDONLY)) |
1092 | sb->s_flags |= MS_RDONLY; | |
1093 | ext2_write_super(sb); | |
1da177e4 LT |
1094 | return 0; |
1095 | ||
1096 | cantfind_ext2: | |
1097 | if (!silent) | |
2314b07c AF |
1098 | ext2_msg(sb, KERN_ERR, |
1099 | "error: can't find an ext2 filesystem on dev %s.", | |
1100 | sb->s_id); | |
1da177e4 | 1101 | goto failed_mount; |
0216bfcf MC |
1102 | failed_mount3: |
1103 | percpu_counter_destroy(&sbi->s_freeblocks_counter); | |
1104 | percpu_counter_destroy(&sbi->s_freeinodes_counter); | |
1105 | percpu_counter_destroy(&sbi->s_dirs_counter); | |
1da177e4 LT |
1106 | failed_mount2: |
1107 | for (i = 0; i < db_count; i++) | |
1108 | brelse(sbi->s_group_desc[i]); | |
1109 | failed_mount_group_desc: | |
1110 | kfree(sbi->s_group_desc); | |
1111 | kfree(sbi->s_debts); | |
1112 | failed_mount: | |
1113 | brelse(bh); | |
1114 | failed_sbi: | |
1115 | sb->s_fs_info = NULL; | |
0f7ee7c1 | 1116 | kfree(sbi->s_blockgroup_lock); |
1da177e4 | 1117 | kfree(sbi); |
db719222 | 1118 | failed_unlock: |
52fcf703 | 1119 | return ret; |
1da177e4 LT |
1120 | } |
1121 | ||
7bf0dc9b TT |
1122 | static void ext2_clear_super_error(struct super_block *sb) |
1123 | { | |
1124 | struct buffer_head *sbh = EXT2_SB(sb)->s_sbh; | |
1125 | ||
1126 | if (buffer_write_io_error(sbh)) { | |
1127 | /* | |
1128 | * Oh, dear. A previous attempt to write the | |
1129 | * superblock failed. This could happen because the | |
1130 | * USB device was yanked out. Or it could happen to | |
1131 | * be a transient write error and maybe the block will | |
1132 | * be remapped. Nothing we can do but to retry the | |
1133 | * write and hope for the best. | |
1134 | */ | |
2b8120ef JB |
1135 | ext2_msg(sb, KERN_ERR, |
1136 | "previous I/O error to superblock detected\n"); | |
7bf0dc9b TT |
1137 | clear_buffer_write_io_error(sbh); |
1138 | set_buffer_uptodate(sbh); | |
1139 | } | |
1140 | } | |
1141 | ||
ee6921eb JB |
1142 | static void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es, |
1143 | int wait) | |
1da177e4 | 1144 | { |
7bf0dc9b | 1145 | ext2_clear_super_error(sb); |
c15271f4 | 1146 | spin_lock(&EXT2_SB(sb)->s_lock); |
1da177e4 LT |
1147 | es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb)); |
1148 | es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb)); | |
1149 | es->s_wtime = cpu_to_le32(get_seconds()); | |
c15271f4 JB |
1150 | /* unlock before we do IO */ |
1151 | spin_unlock(&EXT2_SB(sb)->s_lock); | |
1da177e4 | 1152 | mark_buffer_dirty(EXT2_SB(sb)->s_sbh); |
ee6921eb JB |
1153 | if (wait) |
1154 | sync_dirty_buffer(EXT2_SB(sb)->s_sbh); | |
1da177e4 LT |
1155 | sb->s_dirt = 0; |
1156 | } | |
1157 | ||
1158 | /* | |
1159 | * In the second extended file system, it is not necessary to | |
1160 | * write the super block since we use a mapping of the | |
1161 | * disk super block in a buffer. | |
1162 | * | |
1163 | * However, this function is still used to set the fs valid | |
1164 | * flags to 0. We need to set this flag to 0 since the fs | |
1165 | * may have been checked while mounted and e2fsck may have | |
1166 | * set s_state to EXT2_VALID_FS after some corrections. | |
1167 | */ | |
40f31dd4 | 1168 | static int ext2_sync_fs(struct super_block *sb, int wait) |
1da177e4 | 1169 | { |
c15271f4 | 1170 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
40f31dd4 CH |
1171 | struct ext2_super_block *es = EXT2_SB(sb)->s_es; |
1172 | ||
c15271f4 | 1173 | spin_lock(&sbi->s_lock); |
40f31dd4 CH |
1174 | if (es->s_state & cpu_to_le16(EXT2_VALID_FS)) { |
1175 | ext2_debug("setting valid to 0\n"); | |
1176 | es->s_state &= cpu_to_le16(~EXT2_VALID_FS); | |
1da177e4 | 1177 | } |
c15271f4 | 1178 | spin_unlock(&sbi->s_lock); |
ee6921eb | 1179 | ext2_sync_super(sb, es, wait); |
40f31dd4 CH |
1180 | return 0; |
1181 | } | |
1182 | ||
1183 | ||
1184 | void ext2_write_super(struct super_block *sb) | |
1185 | { | |
1186 | if (!(sb->s_flags & MS_RDONLY)) | |
1187 | ext2_sync_fs(sb, 1); | |
1188 | else | |
1189 | sb->s_dirt = 0; | |
1da177e4 LT |
1190 | } |
1191 | ||
1192 | static int ext2_remount (struct super_block * sb, int * flags, char * data) | |
1193 | { | |
1194 | struct ext2_sb_info * sbi = EXT2_SB(sb); | |
1195 | struct ext2_super_block * es; | |
6d79125b | 1196 | unsigned long old_mount_opt = sbi->s_mount_opt; |
50a52234 JK |
1197 | struct ext2_mount_options old_opts; |
1198 | unsigned long old_sb_flags; | |
1199 | int err; | |
1200 | ||
c15271f4 | 1201 | spin_lock(&sbi->s_lock); |
337eb00a | 1202 | |
50a52234 JK |
1203 | /* Store the old options */ |
1204 | old_sb_flags = sb->s_flags; | |
1205 | old_opts.s_mount_opt = sbi->s_mount_opt; | |
1206 | old_opts.s_resuid = sbi->s_resuid; | |
1207 | old_opts.s_resgid = sbi->s_resgid; | |
1da177e4 LT |
1208 | |
1209 | /* | |
1210 | * Allow the "check" option to be passed as a remount option. | |
1211 | */ | |
2314b07c | 1212 | if (!parse_options(data, sb)) { |
50a52234 JK |
1213 | err = -EINVAL; |
1214 | goto restore_opts; | |
1215 | } | |
1da177e4 LT |
1216 | |
1217 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | | |
1218 | ((sbi->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); | |
1219 | ||
266f5aa0 CO |
1220 | ext2_xip_verify_sb(sb); /* see if bdev supports xip, unset |
1221 | EXT2_MOUNT_XIP if not */ | |
1222 | ||
1223 | if ((ext2_use_xip(sb)) && (sb->s_blocksize != PAGE_SIZE)) { | |
2314b07c AF |
1224 | ext2_msg(sb, KERN_WARNING, |
1225 | "warning: unsupported blocksize for xip"); | |
ddc80bd7 | 1226 | err = -EINVAL; |
266f5aa0 CO |
1227 | goto restore_opts; |
1228 | } | |
1229 | ||
1da177e4 | 1230 | es = sbi->s_es; |
8e3b9a07 | 1231 | if ((sbi->s_mount_opt ^ old_mount_opt) & EXT2_MOUNT_XIP) { |
2314b07c AF |
1232 | ext2_msg(sb, KERN_WARNING, "warning: refusing change of " |
1233 | "xip flag with busy inodes while remounting"); | |
0e4a9b59 CO |
1234 | sbi->s_mount_opt &= ~EXT2_MOUNT_XIP; |
1235 | sbi->s_mount_opt |= old_mount_opt & EXT2_MOUNT_XIP; | |
1236 | } | |
337eb00a | 1237 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) { |
c15271f4 | 1238 | spin_unlock(&sbi->s_lock); |
1da177e4 | 1239 | return 0; |
337eb00a | 1240 | } |
1da177e4 LT |
1241 | if (*flags & MS_RDONLY) { |
1242 | if (le16_to_cpu(es->s_state) & EXT2_VALID_FS || | |
337eb00a | 1243 | !(sbi->s_mount_state & EXT2_VALID_FS)) { |
c15271f4 | 1244 | spin_unlock(&sbi->s_lock); |
1da177e4 | 1245 | return 0; |
337eb00a | 1246 | } |
c79d967d | 1247 | |
1da177e4 LT |
1248 | /* |
1249 | * OK, we are remounting a valid rw partition rdonly, so set | |
1250 | * the rdonly flag and then mark the partition as valid again. | |
1251 | */ | |
1252 | es->s_state = cpu_to_le16(sbi->s_mount_state); | |
1253 | es->s_mtime = cpu_to_le32(get_seconds()); | |
c15271f4 | 1254 | spin_unlock(&sbi->s_lock); |
c79d967d | 1255 | |
0f0dd62f CH |
1256 | err = dquot_suspend(sb, -1); |
1257 | if (err < 0) { | |
c79d967d CH |
1258 | spin_lock(&sbi->s_lock); |
1259 | goto restore_opts; | |
1260 | } | |
1261 | ||
4c96a68b | 1262 | ext2_sync_super(sb, es, 1); |
1da177e4 LT |
1263 | } else { |
1264 | __le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb, | |
1265 | ~EXT2_FEATURE_RO_COMPAT_SUPP); | |
1266 | if (ret) { | |
2314b07c AF |
1267 | ext2_msg(sb, KERN_WARNING, |
1268 | "warning: couldn't remount RDWR because of " | |
1269 | "unsupported optional features (%x).", | |
1270 | le32_to_cpu(ret)); | |
50a52234 JK |
1271 | err = -EROFS; |
1272 | goto restore_opts; | |
1da177e4 LT |
1273 | } |
1274 | /* | |
1275 | * Mounting a RDONLY partition read-write, so reread and | |
1276 | * store the current valid flag. (It may have been changed | |
1277 | * by e2fsck since we originally mounted the partition.) | |
1278 | */ | |
1279 | sbi->s_mount_state = le16_to_cpu(es->s_state); | |
1280 | if (!ext2_setup_super (sb, es, 0)) | |
1281 | sb->s_flags &= ~MS_RDONLY; | |
c15271f4 | 1282 | spin_unlock(&sbi->s_lock); |
c79d967d | 1283 | |
4c96a68b | 1284 | ext2_write_super(sb); |
c79d967d | 1285 | |
0f0dd62f | 1286 | dquot_resume(sb, -1); |
1da177e4 | 1287 | } |
c79d967d | 1288 | |
1da177e4 | 1289 | return 0; |
50a52234 JK |
1290 | restore_opts: |
1291 | sbi->s_mount_opt = old_opts.s_mount_opt; | |
1292 | sbi->s_resuid = old_opts.s_resuid; | |
1293 | sbi->s_resgid = old_opts.s_resgid; | |
1294 | sb->s_flags = old_sb_flags; | |
c15271f4 | 1295 | spin_unlock(&sbi->s_lock); |
50a52234 | 1296 | return err; |
1da177e4 LT |
1297 | } |
1298 | ||
726c3342 | 1299 | static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf) |
1da177e4 | 1300 | { |
726c3342 | 1301 | struct super_block *sb = dentry->d_sb; |
1da177e4 | 1302 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
e4fca01e | 1303 | struct ext2_super_block *es = sbi->s_es; |
e4fca01e | 1304 | u64 fsid; |
1da177e4 | 1305 | |
c15271f4 JB |
1306 | spin_lock(&sbi->s_lock); |
1307 | ||
1da177e4 | 1308 | if (test_opt (sb, MINIX_DF)) |
2235219b BP |
1309 | sbi->s_overhead_last = 0; |
1310 | else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) { | |
1311 | unsigned long i, overhead = 0; | |
1312 | smp_rmb(); | |
1313 | ||
1da177e4 | 1314 | /* |
2235219b BP |
1315 | * Compute the overhead (FS structures). This is constant |
1316 | * for a given filesystem unless the number of block groups | |
1317 | * changes so we cache the previous value until it does. | |
1da177e4 LT |
1318 | */ |
1319 | ||
1320 | /* | |
1321 | * All of the blocks before first_data_block are | |
1322 | * overhead | |
1323 | */ | |
e4fca01e | 1324 | overhead = le32_to_cpu(es->s_first_data_block); |
1da177e4 LT |
1325 | |
1326 | /* | |
1327 | * Add the overhead attributed to the superblock and | |
1328 | * block group descriptors. If the sparse superblocks | |
1329 | * feature is turned on, then not all groups have this. | |
1330 | */ | |
1331 | for (i = 0; i < sbi->s_groups_count; i++) | |
1332 | overhead += ext2_bg_has_super(sb, i) + | |
1333 | ext2_bg_num_gdb(sb, i); | |
1334 | ||
1335 | /* | |
1336 | * Every block group has an inode bitmap, a block | |
1337 | * bitmap, and an inode table. | |
1338 | */ | |
1339 | overhead += (sbi->s_groups_count * | |
1340 | (2 + sbi->s_itb_per_group)); | |
2235219b BP |
1341 | sbi->s_overhead_last = overhead; |
1342 | smp_wmb(); | |
1343 | sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count); | |
1da177e4 LT |
1344 | } |
1345 | ||
1346 | buf->f_type = EXT2_SUPER_MAGIC; | |
1347 | buf->f_bsize = sb->s_blocksize; | |
2235219b | 1348 | buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last; |
1da177e4 | 1349 | buf->f_bfree = ext2_count_free_blocks(sb); |
2235219b | 1350 | es->s_free_blocks_count = cpu_to_le32(buf->f_bfree); |
e4fca01e PE |
1351 | buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count); |
1352 | if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count)) | |
1da177e4 | 1353 | buf->f_bavail = 0; |
e4fca01e PE |
1354 | buf->f_files = le32_to_cpu(es->s_inodes_count); |
1355 | buf->f_ffree = ext2_count_free_inodes(sb); | |
2235219b | 1356 | es->s_free_inodes_count = cpu_to_le32(buf->f_ffree); |
1da177e4 | 1357 | buf->f_namelen = EXT2_NAME_LEN; |
e4fca01e PE |
1358 | fsid = le64_to_cpup((void *)es->s_uuid) ^ |
1359 | le64_to_cpup((void *)es->s_uuid + sizeof(u64)); | |
1360 | buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL; | |
1361 | buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL; | |
c15271f4 | 1362 | spin_unlock(&sbi->s_lock); |
1da177e4 LT |
1363 | return 0; |
1364 | } | |
1365 | ||
152a0836 AV |
1366 | static struct dentry *ext2_mount(struct file_system_type *fs_type, |
1367 | int flags, const char *dev_name, void *data) | |
1da177e4 | 1368 | { |
152a0836 | 1369 | return mount_bdev(fs_type, flags, dev_name, data, ext2_fill_super); |
1da177e4 LT |
1370 | } |
1371 | ||
1372 | #ifdef CONFIG_QUOTA | |
1373 | ||
1374 | /* Read data from quotafile - avoid pagecache and such because we cannot afford | |
1375 | * acquiring the locks... As quota files are never truncated and quota code | |
1376 | * itself serializes the operations (and noone else should touch the files) | |
1377 | * we don't have to be afraid of races */ | |
1378 | static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, | |
1379 | size_t len, loff_t off) | |
1380 | { | |
1381 | struct inode *inode = sb_dqopt(sb)->files[type]; | |
1382 | sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); | |
1383 | int err = 0; | |
1384 | int offset = off & (sb->s_blocksize - 1); | |
1385 | int tocopy; | |
1386 | size_t toread; | |
1387 | struct buffer_head tmp_bh; | |
1388 | struct buffer_head *bh; | |
1389 | loff_t i_size = i_size_read(inode); | |
1390 | ||
1391 | if (off > i_size) | |
1392 | return 0; | |
1393 | if (off+len > i_size) | |
1394 | len = i_size-off; | |
1395 | toread = len; | |
1396 | while (toread > 0) { | |
1397 | tocopy = sb->s_blocksize - offset < toread ? | |
1398 | sb->s_blocksize - offset : toread; | |
1399 | ||
1400 | tmp_bh.b_state = 0; | |
c16831b4 | 1401 | tmp_bh.b_size = sb->s_blocksize; |
1da177e4 | 1402 | err = ext2_get_block(inode, blk, &tmp_bh, 0); |
a686cd89 | 1403 | if (err < 0) |
1da177e4 LT |
1404 | return err; |
1405 | if (!buffer_mapped(&tmp_bh)) /* A hole? */ | |
1406 | memset(data, 0, tocopy); | |
1407 | else { | |
1408 | bh = sb_bread(sb, tmp_bh.b_blocknr); | |
1409 | if (!bh) | |
1410 | return -EIO; | |
1411 | memcpy(data, bh->b_data+offset, tocopy); | |
1412 | brelse(bh); | |
1413 | } | |
1414 | offset = 0; | |
1415 | toread -= tocopy; | |
1416 | data += tocopy; | |
1417 | blk++; | |
1418 | } | |
1419 | return len; | |
1420 | } | |
1421 | ||
1422 | /* Write to quotafile */ | |
1423 | static ssize_t ext2_quota_write(struct super_block *sb, int type, | |
1424 | const char *data, size_t len, loff_t off) | |
1425 | { | |
1426 | struct inode *inode = sb_dqopt(sb)->files[type]; | |
1427 | sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); | |
1428 | int err = 0; | |
1429 | int offset = off & (sb->s_blocksize - 1); | |
1430 | int tocopy; | |
1431 | size_t towrite = len; | |
1432 | struct buffer_head tmp_bh; | |
1433 | struct buffer_head *bh; | |
1434 | ||
5c81a419 | 1435 | mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); |
1da177e4 LT |
1436 | while (towrite > 0) { |
1437 | tocopy = sb->s_blocksize - offset < towrite ? | |
1438 | sb->s_blocksize - offset : towrite; | |
1439 | ||
1440 | tmp_bh.b_state = 0; | |
1441 | err = ext2_get_block(inode, blk, &tmp_bh, 1); | |
a686cd89 | 1442 | if (err < 0) |
1da177e4 LT |
1443 | goto out; |
1444 | if (offset || tocopy != EXT2_BLOCK_SIZE(sb)) | |
1445 | bh = sb_bread(sb, tmp_bh.b_blocknr); | |
1446 | else | |
1447 | bh = sb_getblk(sb, tmp_bh.b_blocknr); | |
1448 | if (!bh) { | |
1449 | err = -EIO; | |
1450 | goto out; | |
1451 | } | |
1452 | lock_buffer(bh); | |
1453 | memcpy(bh->b_data+offset, data, tocopy); | |
1454 | flush_dcache_page(bh->b_page); | |
1455 | set_buffer_uptodate(bh); | |
1456 | mark_buffer_dirty(bh); | |
1457 | unlock_buffer(bh); | |
1458 | brelse(bh); | |
1459 | offset = 0; | |
1460 | towrite -= tocopy; | |
1461 | data += tocopy; | |
1462 | blk++; | |
1463 | } | |
1464 | out: | |
a069e9ce DC |
1465 | if (len == towrite) { |
1466 | mutex_unlock(&inode->i_mutex); | |
1da177e4 | 1467 | return err; |
a069e9ce | 1468 | } |
1da177e4 LT |
1469 | if (inode->i_size < off+len-towrite) |
1470 | i_size_write(inode, off+len-towrite); | |
1471 | inode->i_version++; | |
1472 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
1473 | mark_inode_dirty(inode); | |
1b1dcc1b | 1474 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
1475 | return len - towrite; |
1476 | } | |
1477 | ||
1478 | #endif | |
1479 | ||
1480 | static struct file_system_type ext2_fs_type = { | |
1481 | .owner = THIS_MODULE, | |
1482 | .name = "ext2", | |
152a0836 | 1483 | .mount = ext2_mount, |
1da177e4 LT |
1484 | .kill_sb = kill_block_super, |
1485 | .fs_flags = FS_REQUIRES_DEV, | |
1486 | }; | |
1487 | ||
1488 | static int __init init_ext2_fs(void) | |
1489 | { | |
1490 | int err = init_ext2_xattr(); | |
1491 | if (err) | |
1492 | return err; | |
1493 | err = init_inodecache(); | |
1494 | if (err) | |
1495 | goto out1; | |
1496 | err = register_filesystem(&ext2_fs_type); | |
1497 | if (err) | |
1498 | goto out; | |
1499 | return 0; | |
1500 | out: | |
1501 | destroy_inodecache(); | |
1502 | out1: | |
1503 | exit_ext2_xattr(); | |
1504 | return err; | |
1505 | } | |
1506 | ||
1507 | static void __exit exit_ext2_fs(void) | |
1508 | { | |
1509 | unregister_filesystem(&ext2_fs_type); | |
1510 | destroy_inodecache(); | |
1511 | exit_ext2_xattr(); | |
1512 | } | |
1513 | ||
1514 | module_init(init_ext2_fs) | |
1515 | module_exit(exit_ext2_fs) |